J. F. MeClendon 21 
of the cylinder is passed a large glass tube that fits snugly in the 
hole. Inside the large tube, three small glass tubes and a rubber 
tube are passed and cemented in with sealing-wax. The rubber 
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‘Fia. 1. 
tube is 1 mm. bore and filled with a saturated KCl solution. 
The inner end hangs down in the cylinder and is closed with a bit 
of match that had been boiled in saturated KCl solution. The 
